QUARTERLY FINANCIAL DATA (UNAUDITED) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
QUARTERLY FINANCIAL DATA (UNAUDITED)
Revenue	$ 141,101	$ 143,988	$ 144,205	$ 139,066	$ 131,956	$ 109,793	$ 93,268	$ 88,670	$ 568,360	$ 423,687	$ 301,378
Gross profit	53,685	49,701	51,467	47,306	47,492	36,454	30,171	33,721	202,159	147,838	112,319
Income before income taxes and non-controlling interests	31,599	30,982	32,128	29,940	30,757	20,805	16,537	17,811	124,649	85,910	55,771
Net income	31,354	28,084	29,352	27,121	28,191	18,962	14,690	16,124	115,911	77,967	56,174
Net income attributable to Altisource	$ 30,293	$ 27,024	$ 28,081	$ 25,229	$ 25,731	$ 17,171	$ 13,385	$ 14,825	$ 110,627	$ 71,112	$ 49,271
Net income per share
Basic (in dollars per share)	$ 1.30	$ 1.16	$ 1.20	$ 1.08	$ 1.09	$ 0.71	$ 0.54	$ 0.60	$ 4.74	$ 2.92	$ 1.96
Diluted (in dollars per share)	$ 1.20	$ 1.08	$ 1.13	$ 1.02	$ 1.02	$ 0.67	$ 0.52	$ 0.57	$ 4.43	$ 2.77	$ 1.88
Weighted average shares outstanding
Basic (in shares)	23,389	23,338	23,316	23,381	23,692	24,341	24,625	24,845	23,358	24,373	25,083
Diluted (in shares)	25,162	25,016	24,846	24,844	25,142	25,489	25,773	25,928	24,962	25,685	26,259